Falling in love can make you feel all soft and gooey inside. Unfortunately, it can have the same effect on your outside. Skip a workout here, order some greasy takeout there, and before you know it, you have more than just butterflies in your stomach—you've got a full-on jelly roll hanging over your waistband. Or as Lauren Conrad, former star of The Hills, put it: You've acquired the dreaded "boyfriend layer."

"When we get comfortable in a relationship, we establish new habits together that aren't always the best for our weight," says Amy Gorin, Ph.D., an assistant professor of psychology at the University of Connecticut. WH has identified five of the behaviors that can lead to a serious case of love chub. But don't worry—we've also included easy fixes.